U-Value — Glossary entry
Category: Glossary entry
Thermal transmittance coefficient of building components.
The U-value indicates how much heat passes through a building component when different temperatures prevail on each side. In stair construction, the U-value is particularly relevant for loft ladders and flat-roof access hatches, to evaluate the insulation performance of the lining frames. The lower the value, the better the thermal insulation and the lower the energy losses.
Related terms
Related terms: Loft Ladder (Attic Access Overview), Flat-Roof Access Hatch, Lining Frame, Retractable Loft Ladder (Telescoping), Scissor Ladder.